Hello Jakub,
unfortunately, drawing dotted lines is not supported. In particular cases, if the line is horizontal or vertical, you can achieve the same effect by using a bitmap with a dotted pixel pattern (e.g. 1px line and 2px gap) and display the bitmap in the Wallpaper view. In such case use Alpha8 bitmaps so you can specify the colors flexibly at the runtime.
Best regards
Paul Banach
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